LVS-NAT实验回顾

A.配置LVS-NAT模式

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Client:

[root@localhost ~]# route add default gw 192.168.1.254 dev eth0

GW:

[root@localhost ~]# echo 1 > /proc/sys/net/ipv4/ip_forward

Real Server A & Real Server B:

[root@localhost ~]# yum install httpd

[root@localhost ~]# route add default gw 172.16.1.254 dev eth0

Director:

[root@localhost ~]# echo 1 > /proc/sys/net/ipv4/ip_forward

[root@localhost ~]# route add default gw 1.1.1.254 dev eth0

[root@localhost ~]# yum install ipvsadm

[root@localhost ~]# ipvsadm -A -t 1.1.1.1:80 -s rr

[root@localhost ~]# ipvsadm -a -t 1.1.1.1:80 -r 172.16.1.1:80 -m

[root@localhost ~]# ipvsadm -a -t 1.1.1.1:80 -r 172.16.1.2:80 -m

[root@localhost ~]# ipvsadm -Ln

[root@localhost ~]# ipvsadm -Ln --stats

B.数据包走向

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1.Client---------->GW

sip:CIP dip:VIP

smac:Client_mac dmac:GW_up_mac

2.GW-------------->Director

sip:CIP dip:VIP

smac:GW_down_mac dmac:VIP_mac

3.Director-------->Real Server (DNAT)

sip:CIP dip:RIP

smac:DIP_mac dmac:RealServer_mac

4.Real Server----->Director

sip:RIP dip:CIP

smac:RealServer_mac dmac:DIP_mac

5.Director-------->GW

sip:VIP dip:CIP

smac:VIP_mac dmac:GW_down_mac

6.GW-------------->Client

sip:VIP dip:CIP

smac:GW_up_mac dmac:Client_mac